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It was found that transport properties of gases (viscosity η, thermal conductivity λ, and diffusion coefficients D) in the form of the quantity: C=ηDλTα are temperature independent in the 700–2000K temperature interval. Although the exponent α seems to be independent inside the group for all the monoatomic vapours it seems to change between different groups (α=1.909±0.015 for alkali metal vapours...
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